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02-07-2018, 04:01 PM
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Join Date: Apr 2006
Location: Vancouver island, BC Canada
Posts: 385
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Drilling 7/8" hole in UHMW
Next up is making said holes in F-8115 thrust washers.
What method gives the nicest holes? A carpenter's hole saw may not be accurate or pretty.
Couldn't find any reference to this.
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Jim Green
RV7 tip up
IO360 Whirlwind 200RV
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02-07-2018, 04:22 PM
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Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,931
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Forstner
Quote:
Originally Posted by jimgreen
Next up is making said holes in F-8115 thrust washers.
What method gives the nicest holes? A carpenter's hole saw may not be accurate or pretty.
Couldn't find any reference to this.
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I would use a Forstner bit. Whole set from Harbor Fright is pretty cheap.
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Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 12/03/2019, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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02-08-2018, 12:06 AM
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Join Date: Apr 2006
Location: Vancouver island, BC Canada
Posts: 385
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Thanks Larry. Don't have a HF here but will look at mail order.
Will also try out a step drill bit on some scrap
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Jim Green
RV7 tip up
IO360 Whirlwind 200RV
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02-08-2018, 04:08 AM
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Join Date: Jan 2005
Location: Yorkshire, England
Posts: 2,048
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Home Despot flat whiz bit would work. Make sure the piece is securely anchored else it will tour the shop !
https://www.homedepot.com/p/Bosch-Da...5010/203274429
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"I add a little excitement, a little spice to your lives, and all you do is complain!" - Q
Donated in 2020 
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02-08-2018, 08:29 AM
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Join Date: Dec 2009
Location: Boulder, CO
Posts: 4,428
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Depending on the thickness of the part, a hole saw might work pretty well. You know, one of those things that looks like a cylinder with teeth at the end.
Dave
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02-08-2018, 08:37 AM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,761
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I've found spade bits do a beautiful job on UHMW. Just feed it slowly.
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Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
Last edited by Mel : 02-08-2018 at 11:11 AM.
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02-08-2018, 11:10 AM
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Join Date: Apr 2006
Location: Vancouver island, BC Canada
Posts: 385
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Thanks guys, I'll test out a spade bit first. Path of least resistance etc.
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Jim Green
RV7 tip up
IO360 Whirlwind 200RV
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02-08-2018, 12:06 PM
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Join Date: Jan 2008
Location: Ashland, OR
Posts: 2,561
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Where?
where do these thrust washers go? I don't remember making these.
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Steve Smith
Aeronautical Engineer
RV-8 N825RV
IO-360 A1A
WW 200RV
"The Magic Carpet"
Hobbs 625
LS6-15/18W sailplane SOLD
bought my old LS6-A back!! 
VAF donation Jan 2020
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02-08-2018, 10:05 PM
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Join Date: Apr 2006
Location: Vancouver island, BC Canada
Posts: 385
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They are applicable to the ground adjustable rudder pedals. I don't know about the other style pedals.
They fit on either end of the shaft that the pedals hinge on. It's a strange use of the term as there is no lateral force.
BTW the spade bit worked out great. Quick, easy and I didn't have to buy anything.
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Jim Green
RV7 tip up
IO360 Whirlwind 200RV
Last edited by jimgreen : 02-08-2018 at 10:07 PM.
Reason: added comment
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